14 files changed, 456 insertions, 291 deletions

diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index 092e596a1301..c54b4f503e2a 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -206,7 +206,7 @@ IOMMU (input/output memory management unit)
       (e.g. because you have < 3 GB memory).
       Kernel boot message: "PCI-DMA: Disabling IOMMU"
 
-   2. <arch/x86_64/kernel/pci-gart.c>: AMD GART based hardware IOMMU.
+   2. <arch/x86/kernel/amd_gart_64.c>: AMD GART based hardware IOMMU.
       Kernel boot message: "PCI-DMA: using GART IOMMU"
 
    3. <arch/x86_64/kernel/pci-swiotlb.c> : Software IOMMU implementation. Used
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b9ea9a80faa5..650bb8c47eca 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -689,6 +689,7 @@ config AMD_IOMMU
         bool "AMD IOMMU support"
         select SWIOTLB
         select PCI_MSI
+        select PCI_IOV
         depends on X86_64 && PCI && ACPI
         ---help---
           With this option you can enable support for AMD IOMMU hardware in
diff --git a/arch/x86/include/asm/amd_iommu_proto.h b/arch/x86/include/asm/amd_iommu_proto.h
index 916bc8111a01..55d95eb789b3 100644
--- a/arch/x86/include/asm/amd_iommu_proto.h
+++ b/arch/x86/include/asm/amd_iommu_proto.h
@@ -19,13 +19,12 @@
 #ifndef _ASM_X86_AMD_IOMMU_PROTO_H
 #define _ASM_X86_AMD_IOMMU_PROTO_H
 
-struct amd_iommu;
+#include <asm/amd_iommu_types.h>
 
 extern int amd_iommu_init_dma_ops(void);
 extern int amd_iommu_init_passthrough(void);
+extern irqreturn_t amd_iommu_int_thread(int irq, void *data);
 extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
-extern void amd_iommu_flush_all_domains(void);
-extern void amd_iommu_flush_all_devices(void);
 extern void amd_iommu_apply_erratum_63(u16 devid);
 extern void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu);
 extern int amd_iommu_init_devices(void);
@@ -44,4 +43,12 @@ static inline bool is_rd890_iommu(struct pci_dev *pdev)
                (pdev->device == PCI_DEVICE_ID_RD890_IOMMU);
 }
 
+static inline bool iommu_feature(struct amd_iommu *iommu, u64 f)
+{
+        if (!(iommu->cap & (1 << IOMMU_CAP_EFR)))
+                return false;
+
+        return !!(iommu->features & f);
+}
+
 #endif /* _ASM_X86_AMD_IOMMU_PROTO_H  */
diff --git a/arch/x86/include/asm/amd_iommu_types.h b/arch/x86/include/asm/amd_iommu_types.h
index e3509fc303bf..4c9982995414 100644
--- a/arch/x86/include/asm/amd_iommu_types.h
+++ b/arch/x86/include/asm/amd_iommu_types.h
@@ -68,12 +68,25 @@
 #define MMIO_CONTROL_OFFSET     0x0018
 #define MMIO_EXCL_BASE_OFFSET   0x0020
 #define MMIO_EXCL_LIMIT_OFFSET  0x0028
+#define MMIO_EXT_FEATURES       0x0030
 #define MMIO_CMD_HEAD_OFFSET    0x2000
 #define MMIO_CMD_TAIL_OFFSET    0x2008
 #define MMIO_EVT_HEAD_OFFSET    0x2010
 #define MMIO_EVT_TAIL_OFFSET    0x2018
 #define MMIO_STATUS_OFFSET      0x2020
 
+
+/* Extended Feature Bits */
+#define FEATURE_PREFETCH        (1ULL<<0)
+#define FEATURE_PPR             (1ULL<<1)
+#define FEATURE_X2APIC          (1ULL<<2)
+#define FEATURE_NX              (1ULL<<3)
+#define FEATURE_GT              (1ULL<<4)
+#define FEATURE_IA              (1ULL<<6)
+#define FEATURE_GA              (1ULL<<7)
+#define FEATURE_HE              (1ULL<<8)
+#define FEATURE_PC              (1ULL<<9)
+
 /* MMIO status bits */
 #define MMIO_STATUS_COM_WAIT_INT_MASK   0x04
 
@@ -113,7 +126,9 @@
 /* command specific defines */
 #define CMD_COMPL_WAIT          0x01
 #define CMD_INV_DEV_ENTRY       0x02
-#define CMD_INV_IOMMU_PAGES     0x03
+#define CMD_INV_IOMMU_PAGES     0x03
+#define CMD_INV_IOTLB_PAGES     0x04
+#define CMD_INV_ALL             0x08
 
 #define CMD_COMPL_WAIT_STORE_MASK       0x01
 #define CMD_COMPL_WAIT_INT_MASK         0x02
@@ -215,6 +230,8 @@
 #define IOMMU_PTE_IR (1ULL << 61)
 #define IOMMU_PTE_IW (1ULL << 62)
 
+#define DTE_FLAG_IOTLB  0x01
+
 #define IOMMU_PAGE_MASK (((1ULL << 52) - 1) & ~0xfffULL)
 #define IOMMU_PTE_PRESENT(pte) ((pte) & IOMMU_PTE_P)
 #define IOMMU_PTE_PAGE(pte) (phys_to_virt((pte) & IOMMU_PAGE_MASK))
@@ -227,6 +244,7 @@
 /* IOMMU capabilities */
 #define IOMMU_CAP_IOTLB   24
 #define IOMMU_CAP_NPCACHE 26
+#define IOMMU_CAP_EFR     27
 
 #define MAX_DOMAIN_ID 65536
 
@@ -249,6 +267,8 @@ extern bool amd_iommu_dump;
 
 /* global flag if IOMMUs cache non-present entries */
 extern bool amd_iommu_np_cache;
+/* Only true if all IOMMUs support device IOTLBs */
+extern bool amd_iommu_iotlb_sup;
 
 /*
  * Make iterating over all IOMMUs easier
@@ -371,6 +391,9 @@ struct amd_iommu {
         /* flags read from acpi table */
         u8 acpi_flags;
 
+        /* Extended features */
+        u64 features;
+
         /*
          * Capability pointer. There could be more than one IOMMU per PCI
          * device function if there are more than one AMD IOMMU capability
@@ -409,9 +432,6 @@ struct amd_iommu {
         /* if one, we need to send a completion wait command */
         bool need_sync;
 
-        /* becomes true if a command buffer reset is running */
-        bool reset_in_progress;
-
         /* default dma_ops domain for that IOMMU */
         struct dma_ops_domain *default_dom;
 
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 7338ef2218bc..97ebf82e0b7f 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -117,7 +117,7 @@ obj-$(CONFIG_OF)			+= devicetree.o
 ifeq ($(CONFIG_X86_64),y)
         obj-$(CONFIG_AUDIT)             += audit_64.o
 
-        obj-$(CONFIG_GART_IOMMU)        += pci-gart_64.o aperture_64.o
+        obj-$(CONFIG_GART_IOMMU)        += amd_gart_64.o aperture_64.o
         obj-$(CONFIG_CALGARY_IOMMU)     += pci-calgary_64.o tce_64.o
         obj-$(CONFIG_AMD_IOMMU)         += amd_iommu_init.o amd_iommu.o
 
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/amd_gart_64.c
index b117efd24f71..b117efd24f71 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 57ca77787220..873e7e1ead7b 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -18,6 +18,7 @@
  */
 
 #include <linux/pci.h>
+#include <linux/pci-ats.h>
 #include <linux/bitmap.h>
 #include <linux/slab.h>
 #include <linux/debugfs.h>
@@ -25,6 +26,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/iommu-helper.h>
 #include <linux/iommu.h>
+#include <linux/delay.h>
 #include <asm/proto.h>
 #include <asm/iommu.h>
 #include <asm/gart.h>
@@ -34,7 +36,7 @@
 
 #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
 
-#define EXIT_LOOP_COUNT 10000000
+#define LOOP_TIMEOUT    100000
 
 static DEFINE_RWLOCK(amd_iommu_devtable_lock);
 
@@ -57,7 +59,6 @@ struct iommu_cmd {
         u32 data[4];
 };
 
-static void reset_iommu_command_buffer(struct amd_iommu *iommu);
 static void update_domain(struct protection_domain *domain);
 
 /****************************************************************************
@@ -322,8 +323,6 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
                 break;
         case EVENT_TYPE_ILL_CMD:
                 printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
-                iommu->reset_in_progress = true;
-                reset_iommu_command_buffer(iommu);
                 dump_command(address);
                 break;
         case EVENT_TYPE_CMD_HARD_ERR:
@@ -367,7 +366,7 @@ static void iommu_poll_events(struct amd_iommu *iommu)
         spin_unlock_irqrestore(&iommu->lock, flags);
 }
 
-irqreturn_t amd_iommu_int_handler(int irq, void *data)
+irqreturn_t amd_iommu_int_thread(int irq, void *data)
 {
         struct amd_iommu *iommu;
 
@@ -377,192 +376,300 @@ irqreturn_t amd_iommu_int_handler(int irq, void *data)
         return IRQ_HANDLED;
 }
 
+irqreturn_t amd_iommu_int_handler(int irq, void *data)
+{
+        return IRQ_WAKE_THREAD;
+}
+
 /****************************************************************************
  *
  * IOMMU command queuing functions
  *
  ****************************************************************************/
 
-/*
- * Writes the command to the IOMMUs command buffer and informs the
- * hardware about the new command. Must be called with iommu->lock held.
- */
-static int __iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
+static int wait_on_sem(volatile u64 *sem)
+{
+        int i = 0;
+
+        while (*sem == 0 && i < LOOP_TIMEOUT) {
+                udelay(1);
+                i += 1;
+        }
+
+        if (i == LOOP_TIMEOUT) {
+                pr_alert("AMD-Vi: Completion-Wait loop timed out\n");
+                return -EIO;
+        }
+
+        return 0;
+}
+
+static void copy_cmd_to_buffer(struct amd_iommu *iommu,
+                               struct iommu_cmd *cmd,
+                               u32 tail)
 {
-        u32 tail, head;
         u8 *target;
 
-        WARN_ON(iommu->cmd_buf_size & CMD_BUFFER_UNINITIALIZED);
-        tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
         target = iommu->cmd_buf + tail;
-        memcpy_toio(target, cmd, sizeof(*cmd));
-        tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
-        head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
-        if (tail == head)
-                return -ENOMEM;
+        tail   = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
+
+        /* Copy command to buffer */
+        memcpy(target, cmd, sizeof(*cmd));
+
+        /* Tell the IOMMU about it */
         writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
+}
 
-        return 0;
+static void build_completion_wait(struct iommu_cmd *cmd, u64 address)
+{
+        WARN_ON(address & 0x7ULL);
+
+        memset(cmd, 0, sizeof(*cmd));
+        cmd->data[0] = lower_32_bits(__pa(address)) | CMD_COMPL_WAIT_STORE_MASK;
+        cmd->data[1] = upper_32_bits(__pa(address));
+        cmd->data[2] = 1;
+        CMD_SET_TYPE(cmd, CMD_COMPL_WAIT);
+}
+
+static void build_inv_dte(struct iommu_cmd *cmd, u16 devid)
+{
+        memset(cmd, 0, sizeof(*cmd));
+        cmd->data[0] = devid;
+        CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY);
+}
+
+static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
+                                  size_t size, u16 domid, int pde)
+{
+        u64 pages;
+        int s;
+
+        pages = iommu_num_pages(address, size, PAGE_SIZE);
+        s     = 0;
+
+        if (pages > 1) {
+                /*
+                 * If we have to flush more than one page, flush all
+                 * TLB entries for this domain
+                 */
+                address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
+                s = 1;
+        }
+
+        address &= PAGE_MASK;
+
+        memset(cmd, 0, sizeof(*cmd));
+        cmd->data[1] |= domid;
+        cmd->data[2]  = lower_32_bits(address);
+        cmd->data[3]  = upper_32_bits(address);
+        CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
+        if (s) /* size bit - we flush more than one 4kb page */
+                cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
+        if (pde) /* PDE bit - we wan't flush everything not only the PTEs */
+                cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
+}
+
+static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep,
+                                  u64 address, size_t size)
+{
+        u64 pages;
+        int s;
+
+        pages = iommu_num_pages(address, size, PAGE_SIZE);
+        s     = 0;
+
+        if (pages > 1) {
+                /*
+                 * If we have to flush more than one page, flush all
+                 * TLB entries for this domain
+                 */
+                address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
+                s = 1;
+        }
+
+        address &= PAGE_MASK;
+
+        memset(cmd, 0, sizeof(*cmd));
+        cmd->data[0]  = devid;
+        cmd->data[0] |= (qdep & 0xff) << 24;
+        cmd->data[1]  = devid;
+        cmd->data[2]  = lower_32_bits(address);
+        cmd->data[3]  = upper_32_bits(address);
+        CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
+        if (s)
+                cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
+}
+
+static void build_inv_all(struct iommu_cmd *cmd)
+{
+        memset(cmd, 0, sizeof(*cmd));
+        CMD_SET_TYPE(cmd, CMD_INV_ALL);
 }
 
 /*
- * General queuing function for commands. Takes iommu->lock and calls
- * __iommu_queue_command().
+ * Writes the command to the IOMMUs command buffer and informs the
+ * hardware about the new command.
  */
 static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
 {
+        u32 left, tail, head, next_tail;
         unsigned long flags;
-        int ret;
 
+        WARN_ON(iommu->cmd_buf_size & CMD_BUFFER_UNINITIALIZED);
+
+again:
         spin_lock_irqsave(&iommu->lock, flags);
-        ret = __iommu_queue_command(iommu, cmd);
-        if (!ret)
-                iommu->need_sync = true;
-        spin_unlock_irqrestore(&iommu->lock, flags);
 
-        return ret;
-}
+        head      = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
+        tail      = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
+        next_tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
+        left      = (head - next_tail) % iommu->cmd_buf_size;
 
-/*
- * This function waits until an IOMMU has completed a completion
- * wait command
- */
-static void __iommu_wait_for_completion(struct amd_iommu *iommu)
-{
-        int ready = 0;
-        unsigned status = 0;
-        unsigned long i = 0;
+        if (left <= 2) {
+                struct iommu_cmd sync_cmd;
+                volatile u64 sem = 0;
+                int ret;
 
-        INC_STATS_COUNTER(compl_wait);
+                build_completion_wait(&sync_cmd, (u64)&sem);
+                copy_cmd_to_buffer(iommu, &sync_cmd, tail);
 
-        while (!ready && (i < EXIT_LOOP_COUNT)) {
-                ++i;
-                /* wait for the bit to become one */
-                status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
-                ready = status & MMIO_STATUS_COM_WAIT_INT_MASK;
+                spin_unlock_irqrestore(&iommu->lock, flags);
+
+                if ((ret = wait_on_sem(&sem)) != 0)
+                        return ret;
+
+                goto again;
         }
 
-        /* set bit back to zero */
-        status &= ~MMIO_STATUS_COM_WAIT_INT_MASK;
-        writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET);
+        copy_cmd_to_buffer(iommu, cmd, tail);
+
+        /* We need to sync now to make sure all commands are processed */
+        iommu->need_sync = true;
+
+        spin_unlock_irqrestore(&iommu->lock, flags);
 
-        if (unlikely(i == EXIT_LOOP_COUNT))
-                iommu->reset_in_progress = true;
+        return 0;
 }
 
 /*
  * This function queues a completion wait command into the command
  * buffer of an IOMMU
  */
-static int __iommu_completion_wait(struct amd_iommu *iommu)
+static int iommu_completion_wait(struct amd_iommu *iommu)
 {
         struct iommu_cmd cmd;
+        volatile u64 sem = 0;
+        int ret;
 
-         memset(&cmd, 0, sizeof(cmd));
-         cmd.data[0] = CMD_COMPL_WAIT_INT_MASK;
-         CMD_SET_TYPE(&cmd, CMD_COMPL_WAIT);
+        if (!iommu->need_sync)
+                return 0;
 
-         return __iommu_queue_command(iommu, &cmd);
+        build_completion_wait(&cmd, (u64)&sem);
+
+        ret = iommu_queue_command(iommu, &cmd);
+        if (ret)
+                return ret;
+
+        return wait_on_sem(&sem);
 }
 
-/*
- * This function is called whenever we need to ensure that the IOMMU has
- * completed execution of all commands we sent. It sends a
- * COMPLETION_WAIT command and waits for it to finish. The IOMMU informs
- * us about that by writing a value to a physical address we pass with
- * the command.
- */
-static int iommu_completion_wait(struct amd_iommu *iommu)
+static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid)
 {
-        int ret = 0;
-        unsigned long flags;
+        struct iommu_cmd cmd;
 
-        spin_lock_irqsave(&iommu->lock, flags);
+        build_inv_dte(&cmd, devid);
 
-        if (!iommu->need_sync)
-                goto out;
+        return iommu_queue_command(iommu, &cmd);
+}
 
-        ret = __iommu_completion_wait(iommu);
+static void iommu_flush_dte_all(struct amd_iommu *iommu)
+{
+        u32 devid;
 
-        iommu->need_sync = false;
+        for (devid = 0; devid <= 0xffff; ++devid)
+                iommu_flush_dte(iommu, devid);
 
-        if (ret)
-                goto out;
-
-        __iommu_wait_for_completion(iommu);
+        iommu_completion_wait(iommu);
+}
 
-out:
-        spin_unlock_irqrestore(&iommu->lock, flags);
+/*
+ * This function uses heavy locking and may disable irqs for some time. But
+ * this is no issue because it is only called during resume.
+ */
+static void iommu_flush_tlb_all(struct amd_iommu *iommu)
+{
+        u32 dom_id;
 
-        if (iommu->reset_in_progress)
-                reset_iommu_command_buffer(iommu);
+        for (dom_id = 0; dom_id <= 0xffff; ++dom_id) {
+                struct iommu_cmd cmd;
+                build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
+                                      dom_id, 1);
+                iommu_queue_command(iommu, &cmd);
+        }
 
-        return 0;
+        iommu_completion_wait(iommu);
 }
 
-static void iommu_flush_complete(struct protection_domain *domain)
+static void iommu_flush_all(struct amd_iommu *iommu)
 {
-        int i;
+        struct iommu_cmd cmd;
 
-        for (i = 0; i < amd_iommus_present; ++i) {
-                if (!domain->dev_iommu[i])
-                        continue;
+        build_inv_all(&cmd);
 
-                /*
-                 * Devices of this domain are behind this IOMMU
-                 * We need to wait for completion of all commands.
-                 */
-                iommu_completion_wait(amd_iommus[i]);
+        iommu_queue_command(iommu, &cmd);
+        iommu_completion_wait(iommu);
+}
+
+void iommu_flush_all_caches(struct amd_iommu *iommu)
+{
+        if (iommu_feature(iommu, FEATURE_IA)) {
+                iommu_flush_all(iommu);
+        } else {
+                iommu_flush_dte_all(iommu);
+                iommu_flush_tlb_all(iommu);
         }
 }
 
 /*
- * Command send function for invalidating a device table entry
+ * Command send function for flushing on-device TLB
  */
-static int iommu_flush_device(struct device *dev)
+static int device_flush_iotlb(struct device *dev, u64 address, size_t size)
 {
+        struct pci_dev *pdev = to_pci_dev(dev);
         struct amd_iommu *iommu;
         struct iommu_cmd cmd;
         u16 devid;
+        int qdep;
 
+        qdep  = pci_ats_queue_depth(pdev);
         devid = get_device_id(dev);
         iommu = amd_iommu_rlookup_table[devid];
 
-        /* Build command */
-        memset(&cmd, 0, sizeof(cmd));
-        CMD_SET_TYPE(&cmd, CMD_INV_DEV_ENTRY);
-        cmd.data[0] = devid;
+        build_inv_iotlb_pages(&cmd, devid, qdep, address, size);
 
         return iommu_queue_command(iommu, &cmd);
 }
 
-static void __iommu_build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
-                                          u16 domid, int pde, int s)
-{
-        memset(cmd, 0, sizeof(*cmd));
-        address &= PAGE_MASK;
-        CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
-        cmd->data[1] |= domid;
-        cmd->data[2] = lower_32_bits(address);
-        cmd->data[3] = upper_32_bits(address);
-        if (s) /* size bit - we flush more than one 4kb page */
-                cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
-        if (pde) /* PDE bit - we wan't flush everything not only the PTEs */
-                cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
-}
-
 /*
- * Generic command send function for invalidaing TLB entries
+ * Command send function for invalidating a device table entry
  */
-static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu,
-                u64 address, u16 domid, int pde, int s)
+static int device_flush_dte(struct device *dev)
 {
-        struct iommu_cmd cmd;
+        struct amd_iommu *iommu;
+        struct pci_dev *pdev;
+        u16 devid;
         int ret;
 
-        __iommu_build_inv_iommu_pages(&cmd, address, domid, pde, s);
+        pdev  = to_pci_dev(dev);
+        devid = get_device_id(dev);
+        iommu = amd_iommu_rlookup_table[devid];
 
-        ret = iommu_queue_command(iommu, &cmd);
+        ret = iommu_flush_dte(iommu, devid);
+        if (ret)
+                return ret;
+
+        if (pci_ats_enabled(pdev))
+                ret = device_flush_iotlb(dev, 0, ~0UL);
 
         return ret;
 }
@@ -572,23 +679,14 @@ static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu,
  * It invalidates a single PTE if the range to flush is within a single
  * page. Otherwise it flushes the whole TLB of the IOMMU.
  */
-static void __iommu_flush_pages(struct protection_domain *domain,
-                                u64 address, size_t size, int pde)
+static void __domain_flush_pages(struct protection_domain *domain,
+                                 u64 address, size_t size, int pde)
 {
-        int s = 0, i;
-        unsigned long pages = iommu_num_pages(address, size, PAGE_SIZE);
-
-        address &= PAGE_MASK;
-
-        if (pages > 1) {
-                /*
-                 * If we have to flush more than one page, flush all
-                 * TLB entries for this domain
-                 */
-                address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
-                s = 1;
-        }
+        struct iommu_dev_data *dev_data;
+        struct iommu_cmd cmd;
+        int ret = 0, i;
 
+        build_inv_iommu_pages(&cmd, address, size, domain->id, pde);
 
         for (i = 0; i < amd_iommus_present; ++i) {
                 if (!domain->dev_iommu[i])
@@ -598,101 +696,70 @@ static void __iommu_flush_pages(struct protection_domain *domain,
                  * Devices of this domain are behind this IOMMU
                  * We need a TLB flush
                  */
-                iommu_queue_inv_iommu_pages(amd_iommus[i], address,
-                                            domain->id, pde, s);
+                ret |= iommu_queue_command(amd_iommus[i], &cmd);
+        }
+
+        list_for_each_entry(dev_data, &domain->dev_list, list) {
+                struct pci_dev *pdev = to_pci_dev(dev_data->dev);
+
+                if (!pci_ats_enabled(pdev))
+                        continue;
+
+                ret |= device_flush_iotlb(dev_data->dev, address, size);
         }
 
-        return;
+        WARN_ON(ret);
 }
 
-static void iommu_flush_pages(struct protection_domain *domain,
-                             u64 address, size_t size)
+static void domain_flush_pages(struct protection_domain *domain,
+                               u64 address, size_t size)
 {
-        __iommu_flush_pages(domain, address, size, 0);
+        __domain_flush_pages(domain, address, size, 0);
 }
 
 /* Flush the whole IO/TLB for a given protection domain */
-static void iommu_flush_tlb(struct protection_domain *domain)
+static void domain_flush_tlb(struct protection_domain *domain)
 {
-        __iommu_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0);
+        __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0);
 }
 
 /* Flush the whole IO/TLB for a given protection domain - including PDE */
-static void iommu_flush_tlb_pde(struct protection_domain *domain)
+static void domain_flush_tlb_pde(struct protection_domain *domain)
 {
-        __iommu_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1);
-}
-
-
-/*
- * This function flushes the DTEs for all devices in domain
- */
-static void iommu_flush_domain_devices(struct protection_domain *domain)
-{
-        struct iommu_dev_data *dev_data;
-        unsigned long flags;
-
-        spin_lock_irqsave(&domain->lock, flags);
-
-        list_for_each_entry(dev_data, &domain->dev_list, list)
-                iommu_flush_device(dev_data->dev);
-
-        spin_unlock_irqrestore(&domain->lock, flags);
+        __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1);
 }
 
-static void iommu_flush_all_domain_devices(void)
+static void domain_flush_complete(struct protection_domain *domain)
 {
-        struct protection_domain *domain;
-        unsigned long flags;
+        int i;
 
-        spin_lock_irqsave(&amd_iommu_pd_lock, flags);
+        for (i = 0; i < amd_iommus_present; ++i) {
+                if (!domain->dev_iommu[i])
+                        continue;
 
-        list_for_each_entry(domain, &amd_iommu_pd_list, list) {
-                iommu_flush_domain_devices(domain);
-                iommu_flush_complete(domain);
+                /*
+                 * Devices of this domain are behind this IOMMU
+                 * We need to wait for completion of all commands.
+                 */
+                iommu_completion_wait(amd_iommus[i]);
         }
-
-        spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
 }
 
-void amd_iommu_flush_all_devices(void)
-{
-        iommu_flush_all_domain_devices();
-}
 
 /*
- * This function uses heavy locking and may disable irqs for some time. But
- * this is no issue because it is only called during resume.
+ * This function flushes the DTEs for all devices in domain
  */
-void amd_iommu_flush_all_domains(void)
+static void domain_flush_devices(struct protection_domain *domain)
 {
-        struct protection_domain *domain;
+        struct iommu_dev_data *dev_data;
         unsigned long flags;
 
-        spin_lock_irqsave(&amd_iommu_pd_lock, flags);
-
-        list_for_each_entry(domain, &amd_iommu_pd_list, list) {
-                spin_lock(&domain->lock);
-                iommu_flush_tlb_pde(domain);
-                iommu_flush_complete(domain);
-                spin_unlock(&domain->lock);
-        }
-
-        spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
-}
-
-static void reset_iommu_command_buffer(struct amd_iommu *iommu)
-{
-        pr_err("AMD-Vi: Resetting IOMMU command buffer\n");
-
-        if (iommu->reset_in_progress)
-                panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n");
+        spin_lock_irqsave(&domain->lock, flags);
 
-        amd_iommu_reset_cmd_buffer(iommu);
-        amd_iommu_flush_all_devices();
-        amd_iommu_flush_all_domains();
+        list_for_each_entry(dev_data, &domain->dev_list, list)
+                device_flush_dte(dev_data->dev);
 
-        iommu->reset_in_progress = false;
+        spin_unlock_irqrestore(&domain->lock, flags);
 }
 
 /****************************************************************************
@@ -1410,17 +1477,22 @@ static bool dma_ops_domain(struct protection_domain *domain)
         return domain->flags & PD_DMA_OPS_MASK;
 }
 
-static void set_dte_entry(u16 devid, struct protection_domain *domain)
+static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats)
 {
         u64 pte_root = virt_to_phys(domain->pt_root);
+        u32 flags = 0;
 
         pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
                     << DEV_ENTRY_MODE_SHIFT;
         pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;
 
-        amd_iommu_dev_table[devid].data[2] = domain->id;
-        amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root);
-        amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root);
+        if (ats)
+                flags |= DTE_FLAG_IOTLB;
+
+        amd_iommu_dev_table[devid].data[3] |= flags;
+        amd_iommu_dev_table[devid].data[2]  = domain->id;
+        amd_iommu_dev_table[devid].data[1]  = upper_32_bits(pte_root);
+        amd_iommu_dev_table[devid].data[0]  = lower_32_bits(pte_root);
 }
 
 static void clear_dte_entry(u16 devid)
@@ -1437,34 +1509,42 @@ static void do_attach(struct device *dev, struct protection_domain *domain)
 {
         struct iommu_dev_data *dev_data;
         struct amd_iommu *iommu;
+        struct pci_dev *pdev;
+        bool ats = false;
         u16 devid;
 
         devid    = get_device_id(dev);
         iommu    = amd_iommu_rlookup_table[devid];
         dev_data = get_dev_data(dev);
+        pdev     = to_pci_dev(dev);
+
+        if (amd_iommu_iotlb_sup)
+                ats = pci_ats_enabled(pdev);
 
         /* Update data structures */
         dev_data->domain = domain;
         list_add(&dev_data->list, &domain->dev_list);
-        set_dte_entry(devid, domain);
+        set_dte_entry(devid, domain, ats);
 
         /* Do reference counting */
         domain->dev_iommu[iommu->index] += 1;
         domain->dev_cnt                 += 1;
 
         /* Flush the DTE entry */
-        iommu_flush_device(dev);
+        device_flush_dte(dev);
 }
 
 static void do_detach(struct device *dev)
 {
         struct iommu_dev_data *dev_data;
         struct amd_iommu *iommu;
+        struct pci_dev *pdev;
         u16 devid;
 
         devid    = get_device_id(dev);
         iommu    = amd_iommu_rlookup_table[devid];
         dev_data = get_dev_data(dev);
+        pdev     = to_pci_dev(dev);
 
         /* decrease reference counters */
         dev_data->domain->dev_iommu[iommu->index] -= 1;
@@ -1476,7 +1556,7 @@ static void do_detach(struct device *dev)
         clear_dte_entry(devid);
 
         /* Flush the DTE entry */
-        iommu_flush_device(dev);
+        device_flush_dte(dev);
 }
 
 /*
@@ -1539,9 +1619,13 @@ out_unlock:
 static int attach_device(struct device *dev,
                          struct protection_domain *domain)
 {
+        struct pci_dev *pdev = to_pci_dev(dev);
         unsigned long flags;
         int ret;
 
+        if (amd_iommu_iotlb_sup)
+                pci_enable_ats(pdev, PAGE_SHIFT);
+
         write_lock_irqsave(&amd_iommu_devtable_lock, flags);
         ret = __attach_device(dev, domain);
         write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
@@ -1551,7 +1635,7 @@ static int attach_device(struct device *dev,
          * left the caches in the IOMMU dirty. So we have to flush
          * here to evict all dirty stuff.
          */
-        iommu_flush_tlb_pde(domain);
+        domain_flush_tlb_pde(domain);
 
         return ret;
 }
@@ -1598,12 +1682,16 @@ static void __detach_device(struct device *dev)
  */
 static void detach_device(struct device *dev)
 {
+        struct pci_dev *pdev = to_pci_dev(dev);
         unsigned long flags;
 
         /* lock device table */
         write_lock_irqsave(&amd_iommu_devtable_lock, flags);
         __detach_device(dev);
         write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+
+        if (amd_iommu_iotlb_sup && pci_ats_enabled(pdev))
+                pci_disable_ats(pdev);
 }
 
 /*
@@ -1692,7 +1780,7 @@ static int device_change_notifier(struct notifier_block *nb,
                 goto out;
         }
 
-        iommu_flush_device(dev);
+        device_flush_dte(dev);
         iommu_completion_wait(iommu);
 
 out:
@@ -1753,8 +1841,9 @@ static void update_device_table(struct protection_domain *domain)
         struct iommu_dev_data *dev_data;
 
         list_for_each_entry(dev_data, &domain->dev_list, list) {
+                struct pci_dev *pdev = to_pci_dev(dev_data->dev);
                 u16 devid = get_device_id(dev_data->dev);
-                set_dte_entry(devid, domain);
+                set_dte_entry(devid, domain, pci_ats_enabled(pdev));
         }
 }
 
@@ -1764,8 +1853,9 @@ static void update_domain(struct protection_domain *domain)
                 return;
 
         update_device_table(domain);
-        iommu_flush_domain_devices(domain);
-        iommu_flush_tlb_pde(domain);
+
+        domain_flush_devices(domain);
+        domain_flush_tlb_pde(domain);
 
         domain->updated = false;
 }
@@ -1924,10 +2014,10 @@ retry:
         ADD_STATS_COUNTER(alloced_io_mem, size);
 
         if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
-                iommu_flush_tlb(&dma_dom->domain);
+                domain_flush_tlb(&dma_dom->domain);
                 dma_dom->need_flush = false;
         } else if (unlikely(amd_iommu_np_cache))
-                iommu_flush_pages(&dma_dom->domain, address, size);
+                domain_flush_pages(&dma_dom->domain, address, size);
 
 out:
         return address;
@@ -1976,7 +2066,7 @@ static void __unmap_single(struct dma_ops_domain *dma_dom,
         dma_ops_free_addresses(dma_dom, dma_addr, pages);
 
         if (amd_iommu_unmap_flush || dma_dom->need_flush) {
-                iommu_flush_pages(&dma_dom->domain, flush_addr, size);
+                domain_flush_pages(&dma_dom->domain, flush_addr, size);
                 dma_dom->need_flush = false;
         }
 }
@@ -2012,7 +2102,7 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
         if (addr == DMA_ERROR_CODE)
                 goto out;
 
-        iommu_flush_complete(domain);
+        domain_flush_complete(domain);
 
 out:
         spin_unlock_irqrestore(&domain->lock, flags);
@@ -2039,7 +2129,7 @@ static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
 
         __unmap_single(domain->priv, dma_addr, size, dir);
 
-        iommu_flush_complete(domain);
+        domain_flush_complete(domain);
 
         spin_unlock_irqrestore(&domain->lock, flags);
 }
@@ -2104,7 +2194,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
                         goto unmap;
         }
 
-        iommu_flush_complete(domain);
+        domain_flush_complete(domain);
 
 out:
         spin_unlock_irqrestore(&domain->lock, flags);
@@ -2150,7 +2240,7 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist,
                 s->dma_address = s->dma_length = 0;
         }
 
-        iommu_flush_complete(domain);
+        domain_flush_complete(domain);
 
         spin_unlock_irqrestore(&domain->lock, flags);
 }
@@ -2200,7 +2290,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
                 goto out_free;
         }
 
-        iommu_flush_complete(domain);
+        domain_flush_complete(domain);
 
         spin_unlock_irqrestore(&domain->lock, flags);
 
@@ -2232,7 +2322,7 @@ static void free_coherent(struct device *dev, size_t size,
 
         __unmap_single(domain->priv, dma_addr, size, DMA_BIDIRECTIONAL);
 
-        iommu_flush_complete(domain);
+        domain_flush_complete(domain);
 
         spin_unlock_irqrestore(&domain->lock, flags);
 
@@ -2476,7 +2566,7 @@ static void amd_iommu_detach_device(struct iommu_domain *dom,
         if (!iommu)
                 return;
 
-        iommu_flush_device(dev);
+        device_flush_dte(dev);
         iommu_completion_wait(iommu);
 }
 
@@ -2542,7 +2632,7 @@ static int amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
         unmap_size = iommu_unmap_page(domain, iova, page_size);
         mutex_unlock(&domain->api_lock);
 
-        iommu_flush_tlb_pde(domain);
+        domain_flush_tlb_pde(domain);
 
         return get_order(unmap_size);
 }
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 246d727b65b7..9179c21120a8 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -137,6 +137,7 @@ int amd_iommus_present;
 
 /* IOMMUs have a non-present cache? */
 bool amd_iommu_np_cache __read_mostly;
+bool amd_iommu_iotlb_sup __read_mostly = true;
 
 /*
  * The ACPI table parsing functions set this variable on an error
@@ -180,6 +181,12 @@ static u32 dev_table_size;	/* size of the device table */
 static u32 alias_table_size;    /* size of the alias table */
 static u32 rlookup_table_size;  /* size if the rlookup table */
 
+/*
+ * This function flushes all internal caches of
+ * the IOMMU used by this driver.
+ */
+extern void iommu_flush_all_caches(struct amd_iommu *iommu);
+
 static inline void update_last_devid(u16 devid)
 {
         if (devid > amd_iommu_last_bdf)
@@ -293,9 +300,23 @@ static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
 /* Function to enable the hardware */
 static void iommu_enable(struct amd_iommu *iommu)
 {
-        printk(KERN_INFO "AMD-Vi: Enabling IOMMU at %s cap 0x%hx\n",
+        static const char * const feat_str[] = {
+                "PreF", "PPR", "X2APIC", "NX", "GT", "[5]",
+                "IA", "GA", "HE", "PC", NULL
+        };
+        int i;
+
+        printk(KERN_INFO "AMD-Vi: Enabling IOMMU at %s cap 0x%hx",
                dev_name(&iommu->dev->dev), iommu->cap_ptr);
 
+        if (iommu->cap & (1 << IOMMU_CAP_EFR)) {
+                printk(KERN_CONT " extended features: ");
+                for (i = 0; feat_str[i]; ++i)
+                        if (iommu_feature(iommu, (1ULL << i)))
+                                printk(KERN_CONT " %s", feat_str[i]);
+        }
+        printk(KERN_CONT "\n");
+
         iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
 }
 
@@ -651,7 +672,7 @@ static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
 static void __init init_iommu_from_pci(struct amd_iommu *iommu)
 {
         int cap_ptr = iommu->cap_ptr;
-        u32 range, misc;
+        u32 range, misc, low, high;
         int i, j;
 
         pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
@@ -667,6 +688,15 @@ static void __init init_iommu_from_pci(struct amd_iommu *iommu)
                                         MMIO_GET_LD(range));
         iommu->evt_msi_num = MMIO_MSI_NUM(misc);
 
+        if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
+                amd_iommu_iotlb_sup = false;
+
+        /* read extended feature bits */
+        low  = readl(iommu->mmio_base + MMIO_EXT_FEATURES);
+        high = readl(iommu->mmio_base + MMIO_EXT_FEATURES + 4);
+
+        iommu->features = ((u64)high << 32) | low;
+
         if (!is_rd890_iommu(iommu->dev))
                 return;
 
@@ -1004,10 +1034,11 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
         if (pci_enable_msi(iommu->dev))
                 return 1;
 
-        r = request_irq(iommu->dev->irq, amd_iommu_int_handler,
-                        IRQF_SAMPLE_RANDOM,
-                        "AMD-Vi",
-                        NULL);
+        r = request_threaded_irq(iommu->dev->irq,
+                                 amd_iommu_int_handler,
+                                 amd_iommu_int_thread,
+                                 0, "AMD-Vi",
+                                 iommu->dev);
 
         if (r) {
                 pci_disable_msi(iommu->dev);
@@ -1244,6 +1275,7 @@ static void enable_iommus(void)
                 iommu_set_exclusion_range(iommu);
                 iommu_init_msi(iommu);
                 iommu_enable(iommu);
+                iommu_flush_all_caches(iommu);
         }
 }
 
@@ -1274,8 +1306,8 @@ static void amd_iommu_resume(void)
          * we have to flush after the IOMMUs are enabled because a
          * disabled IOMMU will never execute the commands we send
          */
-        amd_iommu_flush_all_devices();
-        amd_iommu_flush_all_domains();
+        for_each_iommu(iommu)
+                iommu_flush_all_caches(iommu);
 }
 
 static int amd_iommu_suspend(void)
diff --git a/arch/x86/kernel/pci-iommu_table.c b/arch/x86/kernel/pci-iommu_table.c
index 55d745ec1181..35ccf75696eb 100644
--- a/arch/x86/kernel/pci-iommu_table.c
+++ b/arch/x86/kernel/pci-iommu_table.c
@@ -50,20 +50,14 @@ void __init check_iommu_entries(struct iommu_table_entry *start,
                                 struct iommu_table_entry *finish)
 {
         struct iommu_table_entry *p, *q, *x;
-        char sym_p[KSYM_SYMBOL_LEN];
-        char sym_q[KSYM_SYMBOL_LEN];
 
         /* Simple cyclic dependency checker. */
         for (p = start; p < finish; p++) {
                 q = find_dependents_of(start, finish, p);
                 x = find_dependents_of(start, finish, q);
                 if (p == x) {
-                        sprint_symbol(sym_p, (unsigned long)p->detect);
-                        sprint_symbol(sym_q, (unsigned long)q->detect);
-
-                        printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %s depends" \
-                                        " on %s and vice-versa. BREAKING IT.\n",
-                                        sym_p, sym_q);
+                        printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %pS depends on %pS and vice-versa. BREAKING IT.\n",
+                               p->detect, q->detect);
                         /* Heavy handed way..*/
                         x->depend = 0;
                 }
@@ -72,12 +66,8 @@ void __init check_iommu_entries(struct iommu_table_entry *start,
         for (p = start; p < finish; p++) {
                 q = find_dependents_of(p, finish, p);
                 if (q && q > p) {
-                        sprint_symbol(sym_p, (unsigned long)p->detect);
-                        sprint_symbol(sym_q, (unsigned long)q->detect);
-
-                        printk(KERN_ERR "EXECUTION ORDER INVALID! %s "\
-                                        "should be called before %s!\n",
-                                        sym_p, sym_q);
+                        printk(KERN_ERR "EXECUTION ORDER INVALID! %pS should be called before %pS!\n",
+                               p->detect, q->detect);
                 }
         }
 }
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index d552d2c77844..6af6b628175b 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -39,6 +39,7 @@
 #include <linux/syscore_ops.h>
 #include <linux/tboot.h>
 #include <linux/dmi.h>
+#include <linux/pci-ats.h>
 #include <asm/cacheflush.h>
 #include <asm/iommu.h>
 #include "pci.h"
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 553d8ee55c1c..42fae4776515 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -13,6 +13,7 @@
 #include <linux/mutex.h>
 #include <linux/string.h>
 #include <linux/delay.h>
+#include <linux/pci-ats.h>
 #include "pci.h"
 
 #define VIRTFN_ID_LEN   16
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index a6ec200fe5ee..4020025f854e 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -250,15 +250,6 @@ struct pci_sriov {
         u8 __iomem *mstate;     /* VF Migration State Array */
 };
 
-/* Address Translation Service */
-struct pci_ats {
-        int pos;        /* capability position */
-        int stu;        /* Smallest Translation Unit */
-        int qdep;       /* Invalidate Queue Depth */
-        int ref_cnt;    /* Physical Function reference count */
-        unsigned int is_enabled:1;      /* Enable bit is set */
-};
-
 #ifdef CONFIG_PCI_IOV
 extern int pci_iov_init(struct pci_dev *dev);
 extern void pci_iov_release(struct pci_dev *dev);
@@ -269,19 +260,6 @@ extern resource_size_t pci_sriov_resource_alignment(struct pci_dev *dev,
 extern void pci_restore_iov_state(struct pci_dev *dev);
 extern int pci_iov_bus_range(struct pci_bus *bus);
 
-extern int pci_enable_ats(struct pci_dev *dev, int ps);
-extern void pci_disable_ats(struct pci_dev *dev);
-extern int pci_ats_queue_depth(struct pci_dev *dev);
-/**
- * pci_ats_enabled - query the ATS status
- * @dev: the PCI device
- *
- * Returns 1 if ATS capability is enabled, or 0 if not.
- */
-static inline int pci_ats_enabled(struct pci_dev *dev)
-{
-        return dev->ats && dev->ats->is_enabled;
-}
 #else
 static inline int pci_iov_init(struct pci_dev *dev)
 {
@@ -304,21 +282,6 @@ static inline int pci_iov_bus_range(struct pci_bus *bus)
         return 0;
 }
 
-static inline int pci_enable_ats(struct pci_dev *dev, int ps)
-{
-        return -ENODEV;
-}
-static inline void pci_disable_ats(struct pci_dev *dev)
-{
-}
-static inline int pci_ats_queue_depth(struct pci_dev *dev)
-{
-        return -ENODEV;
-}
-static inline int pci_ats_enabled(struct pci_dev *dev)
-{
-        return 0;
-}
 #endif /* CONFIG_PCI_IOV */
 
 static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
new file mode 100644
index 000000000000..655824fa4c76
--- /dev/null
+++ b/include/linux/pci-ats.h
@@ -0,0 +1,52 @@
+#ifndef LINUX_PCI_ATS_H
+#define LINUX_PCI_ATS_H
+
+/* Address Translation Service */
+struct pci_ats {
+        int pos;        /* capability position */
+        int stu;        /* Smallest Translation Unit */
+        int qdep;       /* Invalidate Queue Depth */
+        int ref_cnt;    /* Physical Function reference count */
+        unsigned int is_enabled:1;      /* Enable bit is set */
+};
+
+#ifdef CONFIG_PCI_IOV
+
+extern int pci_enable_ats(struct pci_dev *dev, int ps);
+extern void pci_disable_ats(struct pci_dev *dev);
+extern int pci_ats_queue_depth(struct pci_dev *dev);
+/**
+ * pci_ats_enabled - query the ATS status
+ * @dev: the PCI device
+ *
+ * Returns 1 if ATS capability is enabled, or 0 if not.
+ */
+static inline int pci_ats_enabled(struct pci_dev *dev)
+{
+        return dev->ats && dev->ats->is_enabled;
+}
+
+#else /* CONFIG_PCI_IOV */
+
+static inline int pci_enable_ats(struct pci_dev *dev, int ps)
+{
+        return -ENODEV;
+}
+
+static inline void pci_disable_ats(struct pci_dev *dev)
+{
+}
+
+static inline int pci_ats_queue_depth(struct pci_dev *dev)
+{
+        return -ENODEV;
+}
+
+static inline int pci_ats_enabled(struct pci_dev *dev)
+{
+        return 0;
+}
+
+#endif /* CONFIG_PCI_IOV */
+
+#endif /* LINUX_PCI_ATS_H*/
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 4bfb0471f106..db07bfd9298e 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -649,7 +649,7 @@ out_err:
         return -ENOMEM;
 }
 
-static int device_dma_allocations(struct device *dev)
+static int device_dma_allocations(struct device *dev, struct dma_debug_entry **out_entry)
 {
         struct dma_debug_entry *entry;
         unsigned long flags;
@@ -660,8 +660,10 @@ static int device_dma_allocations(struct device *dev)
         for (i = 0; i < HASH_SIZE; ++i) {
                 spin_lock(&dma_entry_hash[i].lock);
                 list_for_each_entry(entry, &dma_entry_hash[i].list, list) {
-                        if (entry->dev == dev)
+                        if (entry->dev == dev) {
                                 count += 1;
+                                *out_entry = entry;
+                        }
                 }
                 spin_unlock(&dma_entry_hash[i].lock);
         }
@@ -674,6 +676,7 @@ static int device_dma_allocations(struct device *dev)
 static int dma_debug_device_change(struct notifier_block *nb, unsigned long action, void *data)
 {
         struct device *dev = data;
+        struct dma_debug_entry *uninitialized_var(entry);
         int count;
 
         if (global_disable)
@@ -681,12 +684,17 @@ static int dma_debug_device_change(struct notifier_block *nb, unsigned long acti
 
         switch (action) {
         case BUS_NOTIFY_UNBOUND_DRIVER:
-                count = device_dma_allocations(dev);
+                count = device_dma_allocations(dev, &entry);
                 if (count == 0)
                         break;
-                err_printk(dev, NULL, "DMA-API: device driver has pending "
+                err_printk(dev, entry, "DMA-API: device driver has pending "
                                 "DMA allocations while released from device "
-                                "[count=%d]\n", count);
+                                "[count=%d]\n"
+                                "One of leaked entries details: "
+                                "[device address=0x%016llx] [size=%llu bytes] "
+                                "[mapped with %s] [mapped as %s]\n",
+                        count, entry->dev_addr, entry->size,
+                        dir2name[entry->direction], type2name[entry->type]);
                 break;
         default:
                 break;